Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
9 Months Ended
Sep. 30, 2022
Oct. 21, 2022
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2022  
Document Transition Report false  
Entity File Number 001-36120  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 80-0162034  
Entity Address, Address Line One 1615 Wynkoop Street  
Entity Address, City or Town Denver  
Entity Address, State or Province CO  
Entity Address, Postal Zip Code 80202  
City Area Code 303  
Local Phone Number 357-7310  
Title of 12(b) Security Common Stock, par value $0.01  
Trading Symbol AR  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   300,136,446
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001433270  
Amendment Flag false